基于雪岭云杉树轮宽度重建过去339年天山中部巴音布鲁克地区夏季NDVI  

Reconstruction of summer NDVI over the past 339 years based on the tree-ring width of Picea schrenkiana in Bayinbuluke,Central Tianshan,China

作　　者：张权 刘禹[1,3,4,5] 李强[1,3,4] 孙长峰[1,3] 李腾[1,2] 李珮 叶远达 ZHANG Quan;LIU Yu;LI Qiang;SUN Chang-feng;LI Teng;LI Pei;YE Yuan-da(State Key Laboratory of Loess and Quaternary Geology,Institute of Earh Environment,Chinese Academy of Sciences,Xi'an 710061,China;College of Earth and Planetary Sciences,University of the Chinese Academy of Sciences,Beijing 100049,China;Center for Exellence in Quaternary Science and Global Change,Chinese Academy of Sciences,Xi'an 710061,China;China-Pakisan Joint Research Center on Earth Sciences,Islamabad 45320,Pakistan;School of Human Settlements and Civil Engineering,Xi'an Jiaotong University,Xi'an 710054,China)

机构地区：[1]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710061 [2]中国科学院大学地球与行星科学学院,北京100049 [3]中国科学院第四纪科学与全球变化卓越创新中心,西安710061 [4]中巴地球科学联合研究中心,巴基斯坦伊斯兰堡45320西安交通大学人居与土木工程学院,西安710054 [5]中巴地球科学联合研究中心,巴基斯坦伊斯兰堡45320中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710061

出　　处：《应用生态学报》2021年第10期3671-3679,共9页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(U1803245,41873021);中国科学院战略性先导科技专项(B类)(XDB40000000)资助。

摘　　要：归一化差异植被指数(NDVI)被广泛应用于植被研究的各个领域,但由于观测时长较短,难以满足长时间尺度的研究需要。基于巴音布鲁克地区雪岭云杉建立了树轮宽度年表(STD),计算年表和NDVI同气象观测数据的相关系数。结果表明:树轮宽度指数和NDVI均与同时段的气象数据具有显著相关。结合宽度年表与6—8月NDVI间的显著正相关(r=0.7,P<0.01,n=38),使用回归模型重建了研究区过去339年的夏季(6—8月)NDVI变化序列,在1680—2018年,重建序列有4个高植被覆盖时段(1738—1765、1786—1798、1964—1973和2000—2018年)和5个低植被覆盖时段(1690—1714、1825—1834、1850—1880、1895—1920和1945—1955年)。重建结果也反映了天山中部水文气候。与周边重建的对比显示,当开都河径流量增加,且研究区处于较为潮湿的环境时,植被覆盖相对较高,反之植被覆盖偏低。重建序列的极值也捕捉了历史文献中一系列自然灾害。混合单粒子拉格朗日综合轨迹模型(HYSPLT)后向轨迹模型和风场分析表明,NDVI异常受到西风带来的降水影响。The normalized difference vegetation index(NDVI)is widely used in various fields of vegetation research.Due to the short observation time,however,it is difficult to meet the research needs at long time scale.Here,we established a tree-ring width chronology(STD)based on Picea schrenkiana in Bayinbuluke,and calculated the correlation coefficient of chronology and NDVI with meteorological data.The results showed that both tree-ring width index and NDVI were significantly correlated with meteorological data.Combined with the significant positive correlation between width chronology and NDVI in June-August(r=0.7,P<0.01,n=38),summer NDVI(from June to August)was reconstructed over the past 339 years using a regression model.During 1680-2018,the reconstruction series had four dense vegetation periods(1738-1765,1786-1798,1964-1973 and 2000-2018)and five sparse vegetation periods(1690-1714,1825-1834,1850-1880,1895-1920 and 1945-1955).The reconstruction reflected the hydrological signals in the central Tianshan Mountains.The comparison with the surrounding reconstructions revealed that when the runoff of Kaidu River increased and the local environment was humid,the vegetation coverage was high;otherwise the vegetation coverage was low.The extreme value of the reconstruction series also captured a series of natural disasters recorded in historical documents.Results of HYSPLT(Hybrid Single-Particle Lagrangian Integrated Trajectory Model)backward trajectory model and wind field analysis showed that NDVI anomalies were affected by the precipitation from Westerlies.

关 键 词：天山中部 树轮宽度 NDVI重建 气候响应 

分 类 号：S791.18[农业科学—林木遗传育种]